Audio (9:23) of the Radio Republik Indonesia broadcast of 1 October 1965 announcing the 30 September Movement's 'Dewan Revolusi' (Revolutionary Council), uploaded to the Internet Archive; provenance unverified. Primary source for the coup's opening moments; Gerwani not mentioned in the description.
Masashi Nishihara's 1973 Michigan PhD thesis on Japanese-Indonesian relations 1951-1966: war reparations, the Kishi-Sukarno settlement, lobbies, the Malaysia confrontation and the 'Sukarno groups'. Gerwani appears only once (pp. 285-286): the Nasution-Suharto group's claim that Pemuda Rakyat, Gerwani and SOBSI trained
Journal article by Coen Holtzappel (Journal of Contemporary Asia, 1979) analysing the Untung and Njono trial records to argue the 30 September Movement was steered by Air Force and Army intelligence, with Sjam's Pringgodani group deliberately compromising the PKI and Aidit. Gerwani is mentioned only once, in a footnote
Long Tempo feature (6 Oct 1984), New Order-era 'scattered stories' of 30 Sept-1 Oct 1965 told by witnesses: Catherine Panjaitan, Dewi Sukarno, Bambang Wijanarko, Mangil, Roeslan Abdulgani, Sugandhi, Salim Said, Syu'bah Asa. Frames events as a PKI coup and describes army/RRI takeover. Gerwani is not mentioned.